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Hi Liz. Goldfish do not become pregnant. They lay eggs. Whether the eggs will ever hatch depend on many things. Is there a male fish to fertilize the eggs, do you have the proper temperature in your tank, is your water being kept at the proper PH levels, etc. I'm going to give you some links that will explain the process to you in much better detail than I could do in this format. Check out all these sites and study the information very closely. I think it will help you out but if you have any more questons, just let me know. Patricia
Click here: Breeding Goldfish and Fry (baby fish) Care
Click here: Breeding
Click here: Breeding Goldfish and Raising Baby Goldfish Fry.